If you happen to be in China and find yourself wondering where all the old people are — just follow the music. On most mornings, loud EDM, tinged with strokes of traditional Chinese music, blasts from giant speakers in the nation’s parks. Those parks fill with grandmas and a smattering of grandpas who have forsaken tai chi for “sailor dancing.”

According to Vice, sailor dancing is a variation on square dancing, the grannies do it in matching uniforms and they are as cool as their grandchildren when it comes to hooking up with fellow practitioners.

They connect via Tangdou Square Dance, an app that Vice likens to the “Tinder of square dancing,” though it also serves as a hub for Sailor Dancing videos. Like the dating app, Tangdou puts people together who live in similar areas. Group leaders use it to help recruit geriatric hoofers.

The old folks like their dance sessions for the sense of community and for the exercise. But others in China are less in-step. A government official told International Business Times, “Dancing in public squares represents the collective aspect of Chinese culture, but now it seems that the overenthusiasm of participants has dealt it a harmful blow with disputes over noise and venues.”

With go-for-it grannies estimated to be 100 million strong in China, the costumes, the banging of percussion instruments and the spectacle of it all have driven some citizens to take extreme measures.

There have been incidents of feces flinging and calls to turn down the music. The Chinese government has taken steps to implement restrictions. As reported by the state news agency: The routines will “no longer vary from community to community but will instead become a nationally unified, scientifically arranged all-new activity that brings positive energy to the people.”

If these rules slow down the creativity and overall beauty of the activity, enthusiasm will not be completely dampened.

“Square dancing is no longer just a way to keep fit,” one can’t-stop-won’t-stop enthusiast told Vice. “It’s now a lifestyle where you can find a sense of belonging. There is a saying among square dancers: ‘If you dance fast enough, the loneliness will not catch up.’ ”